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Objectives The aim of this study was to evaluate the relationship between systemic oxidative balance, and the severity of the disease in patients with COVID 19. Methods Sixty-four patients were divided into three groups according to the severity of the disease: mild (n=28), moderate (n=11) and severe (n=25). Twenty-four healthy controls included to the study. Proinflammatory cytokines (IL-6 and TNF-α), D-dimer, fibrinogen, total oxidative status (TOS), total antioxidant status (TAS) were measured and oxidative stress index (OSI) was calculated. Results The mean age of severe group was significantly higher than the other groups (p=0.001). TAS levels were significantly decreased in all patient groups compared to controls, while serum TOS and OSI levels were significantly different in all three stages of the disease. Serum IL-6 and TNF- α levels were significantly elevated in severe group compared to other groups. TOS and OSI levels were also significantly correlated with IL-6, CRP, ferritin, fibrinogen, LDH and D-dimer. Conclusions TOS and OSI levels are an indicator of systemic oxidative balance in COVID-19 and related to the disease severity. They can be an important marker for evaluating the disease severity and used in the management of patients with COVID-19.

Oxidative stress index can be a new marker related to disease severity in COVID-19